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The PVS-Studio developers' team has carried out comparison of the own static code analyzer PVS-Studio with the open-source Cppcheck static code analyzer. As a material for comparison, the source codes of the three open-source projects by id Software were chosen: Doom 3, Quake 3: Arena, Wolfenstein: Enemy Territory. The article describes the comparison methodology and lists of detected errors. The conclusions section at the end of the article contains "non-conclusions" actually, as we consciously avoid drawing any conclusions: you can reproduce our comparison and draw your own ones.